clutch issue weird..
Thread Starter
Racer
Joined: Feb 2009
Posts: 425
Likes: 0
From: Diamondhead Mississippi
clutch issue weird..
I did a lot of research and couldn't find anyone with my particular issue...
My clutch works fine for every day driving and i have no issues but when i get on it and shift at redline the clutch doesn't come up all the way, only about 4 inches off the floor.. I can still depress it and disengage the clutch but to get it to return to normal position i have to bring it to the top with my foot and pump it a few times.. again this only happens during high rpm shifting...
any suggestions?
ps.. yes i change my clutch fluid about once a month or so..
My clutch works fine for every day driving and i have no issues but when i get on it and shift at redline the clutch doesn't come up all the way, only about 4 inches off the floor.. I can still depress it and disengage the clutch but to get it to return to normal position i have to bring it to the top with my foot and pump it a few times.. again this only happens during high rpm shifting...
any suggestions?
ps.. yes i change my clutch fluid about once a month or so..
Thread Starter
Racer
Joined: Feb 2009
Posts: 425
Likes: 0
From: Diamondhead Mississippi
Race Director
Joined: Dec 2006
Posts: 12,333
Likes: 2,879
From: Fort Worth, Texas
Hmmm, bolt-on power the LS7 clutch should hold. It sounds to me like it is slipping though and creating heat that isn't allowing the diaphragm springs to return. Not sure of the mileage or condition of clutch as fluid could be causing this from a leaking seal in the hydraulics or rear main from sitting for so long. Then again I've seen a warped steel insert on a fidanza flywheel a few times that could be causing it to not get full clamping force. I'd look it over for any possible leaks first and don't see how the master would be causing this as it only disengages the clutch and you don't seem to have a problem under normal driving.
Thread Starter
Racer
Joined: Feb 2009
Posts: 425
Likes: 0
From: Diamondhead Mississippi
Hmmm, bolt-on power the LS7 clutch should hold. It sounds to me like it is slipping though and creating heat that isn't allowing the diaphragm springs to return. Not sure of the mileage or condition of clutch as fluid could be causing this from a leaking seal in the hydraulics or rear main from sitting for so long. Then again I've seen a warped steel insert on a fidanza flywheel a few times that could be causing it to not get full clamping force. I'd look it over for any possible leaks first and don't see how the master would be causing this as it only disengages the clutch and you don't seem to have a problem under normal driving.
Any opinions or thoughts on the cause would be excellent so i can continue trouble shooting it..
also I really appreciate your help with this..
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
The heat from that much of an RPM drop heats the springs in the pressure plate. The pedal comes back up after the springs cool for a few seconds.
Mine did the same thing with bolt-on power. The LS7 clutch is a great fix. If the car has low miles, you can reuse the stock flywheel but definitelt get the assembly balanced from a machine shop when you install it old or new flywheel.
Mine did the same thing with bolt-on power. The LS7 clutch is a great fix. If the car has low miles, you can reuse the stock flywheel but definitelt get the assembly balanced from a machine shop when you install it old or new flywheel.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
I did a lot of research and couldn't find anyone with my particular issue...
My clutch works fine for every day driving and i have no issues but when i get on it and shift at redline the clutch doesn't come up all the way, only about 4 inches off the floor.. I can still depress it and disengage the clutch but to get it to return to normal position i have to bring it to the top with my foot and pump it a few times.. again this only happens during high rpm shifting...
any suggestions?
ps.. yes i change my clutch fluid about once a month or so..
My clutch works fine for every day driving and i have no issues but when i get on it and shift at redline the clutch doesn't come up all the way, only about 4 inches off the floor.. I can still depress it and disengage the clutch but to get it to return to normal position i have to bring it to the top with my foot and pump it a few times.. again this only happens during high rpm shifting...
any suggestions?
ps.. yes i change my clutch fluid about once a month or so..
Mine used to do this after I put in my cam (over 3 years ago) and I took out the spring at that time and it's been fine ever since. I have 55000 daily driving miles and 445 launches on the stock clutch at this point.
It's free to try.
Thread Starter
Racer
Joined: Feb 2009
Posts: 425
Likes: 0
From: Diamondhead Mississippi
Try taking out the pedal spring and see if that cures it.
Mine used to do this after I put in my cam (over 3 years ago) and I took out the spring at that time and it's been fine ever since. I have 55000 daily driving miles and 445 launches on the stock clutch at this point.
It's free to try.
Mine used to do this after I put in my cam (over 3 years ago) and I took out the spring at that time and it's been fine ever since. I have 55000 daily driving miles and 445 launches on the stock clutch at this point.
It's free to try.
I'll go try it today... I'm also going to try to change my clutch fluid again with new stuff..
The heat from that much of an RPM drop heats the springs in the pressure plate. The pedal comes back up after the springs cool for a few seconds.
Mine did the same thing with bolt-on power. The LS7 clutch is a great fix. If the car has low miles, you can reuse the stock flywheel but definitelt get the assembly balanced from a machine shop when you install it old or new flywheel.
Mine did the same thing with bolt-on power. The LS7 clutch is a great fix. If the car has low miles, you can reuse the stock flywheel but definitelt get the assembly balanced from a machine shop when you install it old or new flywheel.
It has an ls7 clutch.. I don't even have to really heat it up.. I can go outside start it and rip down the (closed course) through first and the pedal will stick about half way after going into second..
I guess if all else fails I will have to get a new clutch??? But that kinda sucks because I just put a new one in it..
Really guys thanks for all the help... Imma go try a few things and see how it goes..
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
Even with the clutch spring out my clutch will feel a little stiff after a drag strip run. But after 3-4 pumps on the return road, it's perfect again. I have hot lapped it up to three times many times.
And I launch from 5000-6000 rpm.
Try the spring and report back. There's a how to remove it here.
http://forums.corvetteforum.com/c6-t...ing-in-c6.html
And I launch from 5000-6000 rpm.
Try the spring and report back. There's a how to remove it here.
http://forums.corvetteforum.com/c6-t...ing-in-c6.html
Melting Slicks
Joined: Oct 2010
Posts: 2,220
Likes: 16
From: Sugarhill Ga
try the Tick master cylinder
I replaced mine and it solved 95% of the problem. I really have to abuse the factory ls2 unit for it to stick down. did you get the remote bleeder when you swapped the ls7 clutch?